Update code to use Availability attribute

[tsulim]

Closes #5, closes #66

• Add Availability data field to Person model
• Update commands (e.g., add and edit) to use Availability
• Add sample Availability data to SampleDataUtil
• Update tests to cover Availability
• Update test data with sample Availability data
• Update ui to display Availability in the application

[codecov]

Codecov Report

Attention: Patch coverage is 88.28829% with 13 lines in your changes are missing coverage. Please review.

Project coverage is 79.01%. Comparing base (b9fd49f) to head (6e71003).
Report is 79 commits behind head on master.

Files	Patch %	Lines
...n/java/staffconnect/model/util/SampleDataUtil.java	30.00%	7 Missing ⚠️
src/main/java/staffconnect/ui/PersonCard.java	0.00%	3 Missing ⚠️
.../java/staffconnect/logic/commands/EditCommand.java	95.00%	0 Missing and 1 partial ⚠️
...a/staffconnect/logic/parser/EditCommandParser.java	92.30%	0 Missing and 1 partial ⚠️
...rc/main/java/staffconnect/model/person/Person.java	92.30%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #80      +/-   ##
============================================
+ Coverage     78.33%   79.01%   +0.68%     
- Complexity      529      548      +19     
============================================
  Files            86       87       +1     
  Lines          1620     1687      +67     
  Branches        159      169      +10     
============================================
+ Hits           1269     1333      +64     
- Misses          320      321       +1     
- Partials         31       33       +2     

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[Pluiexo]

Current default behaviour if the the user types nothing for availability, the availability is listed as none of the days, rather than any or all of the days

[whitesnowx]

I think that behaviour is intuitive imo, as opposed to the alternative be that availability be defaulted to all the days

Possible future implementation idea: user can type a/ALL and system parses it as the 7 days

[Pluiexo]

LGTM! Though not to sure if our original intended intention is to have availability be (None of the days) empty if the user types nothing. Others may chip in on what they think

[iynixil]

looks good!